<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <link rel="icon" href="favicon.ico" sizes="32x32">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
</head>

<body>
    <form id="sendForm">
        <input id="sendText" placeholder="Text to send" />
    </form>
    <pre id="incomming" style="height: 200px"></pre>
    <div style="margin: 0 50px 50px 0">
        <audio controls autoplay></audio>
        <input onclick="startRecording()" type="button" value="录音" />
        <input onclick="stopRecording()" type="button" value="停止" />
        <input onclick="playRecording()" type="button" value="播放" />
        <input onclick="uploadAudio()" type="button" value="提交" />
        <input id="rate" type="text" placeholder="频率" />
        <input onclick="ws_start()" type="button" value="WebSocket持续传输" />
        <input onclick="ws_stop()" type="button" value="停止" />
    </div>

    <script type="text/javascript">(function (window) {
            var wsImpl = window.WebSocket || window.MozWebSocket;
            window.ws = new wsImpl('wss://b.buguoheng.com/ws/');
            //兼容
            window.URL = window.URL || window.webkitURL;
            navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;

            var HZRecorder = function (stream, config) {
                config = config || {};
                config.sampleBits = config.sampleBits || 16;      //采样数位 8, 16
                config.sampleRate = config.sampleRate || (44100 / 1);   //采样率(1/6 44100)

                var context = new (window.webkitAudioContext || window.AudioContext)();
                var audioInput = context.createMediaStreamSource(stream);
                var createScript = context.createScriptProcessor || context.createJavaScriptNode;
                var recorder = createScript.apply(context, [4096, 2, 2]);

                var audioData = {
                    size: 0          //录音文件长度
                    , buffer: []     //录音缓存
                    , inputSampleRate: context.sampleRate    //输入采样率
                    , inputSampleBits: 16       //输入采样数位 8, 16
                    , outputSampleRate: config.sampleRate    //输出采样率
                    , oututSampleBits: config.sampleBits       //输出采样数位 8, 16
                    , input: function (data) {
                        this.buffer.push(new Float32Array(data));
                        this.size += data.length;
                    }
                    , compress: function () { //合并压缩
                        //合并
                        var data = new Float32Array(this.size);
                        var offset = 0;
                        for (var i = 0; i < this.buffer.length; i++) {
                            data.set(this.buffer[i], offset);
                            offset += this.buffer[i].length;
                        }
                        //压缩
                        var compression = parseInt(this.inputSampleRate / this.outputSampleRate);
                        var length = data.length / compression;
                        var result = new Float32Array(length);
                        var index = 0, j = 0;
                        while (index < length) {
                            result[index] = data[j];
                            j += compression;
                            index++;
                        }
                        return result;
                    }
                    , encodeWAV: function () {
                        var sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate);
                        var sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits);
                        var bytes = this.compress();
                        var dataLength = bytes.length * (sampleBits / 8);
                        var buffer = new ArrayBuffer(44 + dataLength);
                        var data = new DataView(buffer);

                        var channelCount = 1;//单声道
                        var offset = 0;

                        var writeString = function (str) {
                            for (var i = 0; i < str.length; i++) {
                                data.setUint8(offset + i, str.charCodeAt(i));
                            }
                        }

                        // 资源交换文件标识符 
                        writeString('RIFF'); offset += 4;
                        // 下个地址开始到文件尾总字节数,即文件大小-8 
                        data.setUint32(offset, 36 + dataLength, true); offset += 4;
                        // WAV文件标志
                        writeString('WAVE'); offset += 4;
                        // 波形格式标志 
                        writeString('fmt '); offset += 4;
                        // 过滤字节,一般为 0x10 = 16 
                        data.setUint32(offset, 16, true); offset += 4;
                        // 格式类别 (PCM形式采样数据) 
                        data.setUint16(offset, 1, true); offset += 2;
                        // 通道数 
                        data.setUint16(offset, channelCount, true); offset += 2;
                        // 采样率,每秒样本数,表示每个通道的播放速度 
                        data.setUint32(offset, sampleRate, true); offset += 4;
                        // 波形数据传输率 (每秒平均字节数) 单声道×每秒数据位数×每样本数据位/8 
                        data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true); offset += 4;
                        // 快数据调整数 采样一次占用字节数 单声道×每样本的数据位数/8 
                        data.setUint16(offset, channelCount * (sampleBits / 8), true); offset += 2;
                        // 每样本数据位数 
                        data.setUint16(offset, sampleBits, true); offset += 2;
                        // 数据标识符 
                        writeString('data'); offset += 4;
                        // 采样数据总数,即数据总大小-44 
                        data.setUint32(offset, dataLength, true); offset += 4;
                        // 写入采样数据 
                        if (sampleBits === 8) {
                            for (var i = 0; i < bytes.length; i++ , offset++) {
                                var s = Math.max(-1, Math.min(1, bytes[i]));
                                var val = s < 0 ? s * 0x8000 : s * 0x7FFF;
                                val = parseInt(255 / (65535 / (val + 32768)));
                                data.setInt8(offset, val, true);
                            }
                        } else {
                            for (var i = 0; i < bytes.length; i++ , offset += 2) {
                                var s = Math.max(-1, Math.min(1, bytes[i]));
                                data.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
                            }
                        }

                        return new Blob([data], { type: 'audio/wav' });
                    }
                };

                //开始录音
                this.start = function () {
                    audioInput.connect(recorder);
                    recorder.connect(context.destination);
                }

                //停止
                this.stop = function () {
                    recorder.disconnect();
                }

                //获取音频文件
                this.getBlob = function () {
                    this.stop();
                    return audioData.encodeWAV();
                }

                ws.onmessage = function (evt) { };
                ws.onopen = function () { };
                ws.onclose = function () { }
                this.is_start2 = true;
                this.start2 = function (num_rate) {
                    let start = this.start;
                    let stop = this.stop;
                    let getBlob = this.getBlob;
                    let is_start2 = this.is_start2;
                    setInterval(function () {
                        if (is_start2) {
                            start();
                            setTimeout(function () {
                                if (is_start2) {
                                    stop();
                                    ws.send(getBlob());
                                }
                            }, num_rate || 5000)
                        }
                    }, num_rate || 5000)
                }
                this.play = function (audio) {
                    audio.src = window.URL.createObjectURL(this.getBlob());
                }
                this.upload = function () {
                    ws.send(this.getBlob());
                }
                //音频采集
                recorder.onaudioprocess = function (e) {
                    audioData.input(e.inputBuffer.getChannelData(0));
                    //record(e.inputBuffer.getChannelData(0));
                }
            };
            //抛出异常
            HZRecorder.throwError = function (message) {
                alert(message);
                throw new function () { this.toString = function () { return message; } }
            }
            //是否支持录音
            HZRecorder.canRecording = (navigator.getUserMedia != null);
            //获取录音机
            HZRecorder.get = function (callback, config) {
                if (callback) {
                    if (navigator.getUserMedia) {
                        navigator.getUserMedia(
                            { audio: true } //只启用音频
                            , function (stream) {
                                var rec = new HZRecorder(stream, config);
                                callback(rec);
                            }
                            , function (error) {
                                switch (error.code || error.name) {
                                    case 'PERMISSION_DENIED':
                                    case 'PermissionDeniedError':
                                        HZRecorder.throwError('用户拒绝提供信息。');
                                        break;
                                    case 'NOT_SUPPORTED_ERROR':
                                    case 'NotSupportedError':
                                        HZRecorder.throwError('浏览器不支持硬件设备。');
                                        break;
                                    case 'MANDATORY_UNSATISFIED_ERROR':
                                    case 'MandatoryUnsatisfiedError':
                                        HZRecorder.throwError('无法发现指定的硬件设备。');
                                        break;
                                    default:
                                        HZRecorder.throwError('无法打开麦克风。异常信息:' + (error.code || error.name));
                                        break;
                                }
                            });
                    } else {
                        HZRecorder.throwErr('当前浏览器不支持录音功能。'); return;
                    }
                }
            }
            window.HZRecorder = HZRecorder;
        })(window);</script>
    <script>
        var recorder;
        var audio = document.querySelector('audio');
        function startRecording() {
            HZRecorder.get(function (rec) {
                recorder = rec;
                recorder.start();
            });
        }
        function stopRecording() {
            recorder.stop();
        }
        function playRecording() {
            recorder.play(audio);
        }
        function uploadAudio() {
            recorder.upload(audio);
        }
        function ws_start() {
            HZRecorder.get(function (rec) {
                recorder = rec;
                recorder.is_start2 = true;
                recorder.start2(document.getElementById('rate').value);
            });
        }
        function ws_stop() {
            HZRecorder.get(function (rec) {
                recorder = rec;
                recorder.is_start2 = false;
            });
        }
    </script>
    <script type="text/javascript">
        var start = function () {
            var inc = document.getElementById('incomming');
            var wsImpl = window.WebSocket || window.MozWebSocket;
            var form = document.getElementById('sendForm');
            var input = document.getElementById('sendText');

            inc.innerHTML += "connecting to server ..<br/>";

            // create a new websocket and connect
            // window.ws = new wsImpl('ws://192.168.1.113:7181/');
            //window.ws = new wsImpl('wss://b.buguoheng.com/ws/');
            //window.ws = new wsImpl('ws://192.168.1.199:7181/');

            // when data is comming from the server, this metod is called
            ws.onmessage = function (evt) {
                inc.innerHTML += evt.data + '<br/>';
            };

            // when the connection is established, this method is called
            ws.onopen = function () {
                inc.innerHTML += '.. connection open<br/>';
            };

            // when the connection is closed, this method is called
            ws.onclose = function () {
                inc.innerHTML += '.. connection closed<br/>';
            }

            form.addEventListener('submit', function (e) {
                e.preventDefault();
                var val = input.value;
                ws.send(val);
                input.value = "";
            });

        }
        window.onload = start;
    </script>
</body>

</html>